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The correct answer is B.

OBJ-2.8: If a user or system has configured their email accounts to require two-factor authentication (2FA) or multifactor authentication, then even if they enter their username and password correctly in the third-party email client, they will receive the “Invalid credentials” error message. Some email servers will allow the user to create an Application Specific Password to bypass the multifactor authentication requirement to overcome this. The user will have to use an email client that supports multifactor authentication.

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